Ted,
That 5 volts at KPA100 U4 pin 11 comes from the base K2 - Control Board
U6 pin 24 (and the pullup resistor pins 3 and 4 of RP7).
I suspect CB U6 pin 24 may be shorted.
Since you have 2 K2s, you might try swapping the firmware between them
and see if the problem follows the firmware. Easier if both Control
Boards are at the same level, just swap the Control Boards for the test.
If you swap Control Boards to test, be certain to swap them back - each
contains the filter setup and other menu parameters for its K2.
73,
Don W3FPR
On 8/20/2013 10:39 AM, ted wrote:
Both of my K2s were connected to the same computer and both suffered the
same fate of loss of KIO2 communication. I am not sure of the exact
cause or the exact time it happened.. Several of the USB ports are not
working now and the computer has been taken off line.
I replaced a burned out choke and the MAX1406 IC of the KIO2 board and
all is now well with my low power K2.
I replaced the MAX1406 on the KPA100board, but the KIO2 circuit is still
not functioning.. All the voltages check out except for the 5V required
at pin 11 which measures 0V.
I am not sure where to go from here and any thoughts or help would be
appreciated..
Thanks....ted....aa5ck
--
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